US4299790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and composition for forming a plaster object
Assignee: Individual
•
Filing: 1979-12-18
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Granted: 1981-11-10
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Expires: 1999-12-18
Abstract
Abstract Formation of toy figurines from tap water and a molding powder mixture of calcium sulphate hemihydrate with xanthan gum in a shaker molding assembly. The molded article dries into a porous lightweight object. The materials are non-toxic.
Inventors
- 👤 Allen A. Greenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:16
CPC Classifications
A; A63; A63H; A63H33/00; A63H33/001; C; C04; C04B; C04B24/00; C04B24/24; C04B24/38; C04B24/383; C04B28/00; C04B28/14; C04B28/145
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
88 words
A method of forming a molded plaster object which comprises mixing together approximately 100 parts by weight of water and 60-90 parts by weight of a molding powder by weight, said molding powder comprising calcium sulphate hemihydrate and finely divided xanthan gum in quantities of from 0.25%-1.5% by weight of the molding powder thereof placing the mixture in a mold, allowing the mixture to solidify in said mold, removing the solidified, shaped mixture from the mold, and allowing same to dry to form a porous, low-density plaster object.
Claim 2
Independent Claim
88 words
A method of forming a molded plaster object which comprises mixing together approximately 100 parts by weight of water and 60-90 parts by weight of a molding powder by weight, said molding powder comprising calcium sulphate hemihydrate and finely divided xanthan gum in quantities of from 0.25%-1.5% by weight of the molding powder thereof placing the mixture in a mold, allowing the mixture to solidify in said mold, removing the solidified, shaped mixture from the mold, and allowing same to dry to form a porous, low-density plaster object.
Claim 3
Dependent Claim
13 words
The method of claim 1 containing about 70 parts of the molding powder.
Claim 4
Dependent Claim
34 words
A molding powder consisting essentially of 0.25-1.5% by weight of finely divided Xanthan gum, 0-7.5% K 2 SO 4 , 0-15% CaSO 4 .2H 2 O, and the balance CaSO 4 .1/2H 2 O.
Claim 5
Dependent Claim
34 words
A molding powder consisting essentially of 0.25-1.5% by weight of finely divided Xanthan gum, 0-7.5% K 2 SO 4 , 0-15% CaSO 4 .2H 2 O, and the balance CaSO 4 .1/2H 2 O.
Claim 6
Dependent Claim
15 words
The molding powder of claim 3 further containing minor amounts of starch, colorant and preservatives.
Claim 7
Dependent Claim
32 words
The molding powder of claim 3 wherein the CaSO 4 .1/2H 2 O is a mixture of alpha and beta CaSO 4 .1/2H 2 O in a proportion of 1:3 to 3:1.
Claim 8
Dependent Claim
26 words
The molding powder of claim 3 further containing at least one member selected from the group consisting of locust bean gum, guar gum and polyethylene oxide.
Claim 9
Dependent Claim
11 words
The porous plaster object formed by the method of claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-09 | 1985-05-11 | 1985-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-09 | 1989-05-11 | 1989-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-09 | 1993-05-11 | 1993-11-10 | $7700.00 | Window Closed / Lapsed |